Add appengine app to host and serve webkit layout test results.

        The app allows you post test result files (json) and serve them up.
        Chromium flakiness dashboard will first use this app to host results.json
        and expectations.json, but the files hosted by this app are not limited
        to chromium results or json files. It can be used to host other files if needed.

        https://bugs.webkit.org/show_bug.cgi?id=35944

        * TestResultServer: Added.
        * TestResultServer/app.yaml: Added.
        * TestResultServer/handlers: Added.
        * TestResultServer/handlers/__init__.py: Added.
        * TestResultServer/handlers/menu.py: Added.
        * TestResultServer/handlers/testfilehandler.py: Added.
        * TestResultServer/index.yaml: Added.
        * TestResultServer/main.py: Added.
        * TestResultServer/model: Added.
        * TestResultServer/model/__init__.py: Added.
        * TestResultServer/model/testfile.py: Added.
        * TestResultServer/stylesheets: Added.
        * TestResultServer/stylesheets/form.css: Added.
        * TestResultServer/stylesheets/menu.css: Added.
        * TestResultServer/stylesheets/testfile.css: Added.
        * TestResultServer/templates: Added.
        * TestResultServer/templates/menu.html: Added.
        * TestResultServer/templates/showfilelist.html: Added.
        * TestResultServer/templates/uploadform.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55960 268f45cc-cd09-0410-ab3c-d52691b4dbfc